Pretty much anything can be cooked with children helping you in the kitchen! What you cook obviously depends on your family's likes and dislikes. Your kids can help with various tasks depending on their age, and older kids can even be in charge of making a whole meal - including planning, shopping & time management (so all the food will be ready at the same time). Kids of just about any age can mix, pour, wash, use the blender/food processor, crack eggs, measure, knead dough, stir, and of course, TASTE!
Here are some ideas for things to make:
chili & cornbread
pasta salad
pita sandwiches
fruit salad
tuna/chicken/egg salad
omelettes (everybody can choose their own filling)
mac & cheese (homemade!)
lasagna
stir fry & brown rice
sandwich wraps or roll-ups
guacamole
california rolls, cooked sushi
muffins (can make healthy ones with zucchini & carrots & other veggies)
trail mix/granola
soups/stews
whole grain bread
pizza from scratch